Method and apparatus for determining NDI value on SCI in NR V2X

ABSTRACT

Proposed is an operation method of a first device (100) in a wireless communication system. The method may comprise the steps of: receiving a configured grant from a base station (300); obtaining a first HARQ process identifier (ID) related to a first period of the configured grant; transmitting, to a second device (200), a first PSSCH, on the basis of a first resource included in the first period; obtaining a second HARQ process ID related to a second period of the configured grant; and transmitting, to the second device (200), a second PSSCH, on the basis of a second resource included in the second period.

This application is a Continuation Application of U.S. patentapplication Ser. No. 17/680,638, filed on Feb. 25, 2022, which is aContinuation Application of International Application No.PCT/KR2021/004575, filed on Apr. 12, 2021, which claims the benefit ofand priority to U.S. Provisional Application No. 63/008,505, filed onApr. 10, 2020, the contents of which are all hereby incorporated byreference herein in their entirety.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic.

Vehicle-to-everything (V2X) refers to a communication technology throughwhich a vehicle exchanges information with another vehicle, apedestrian, an object having an infrastructure (or infra) establishedtherein, and so on. The V2X may be divided into 4 types, such asvehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as BSM (Basic Safety Message), CAM(Cooperative Awareness Message), and DENM (Decentralized EnvironmentalNotification Message) is focused in the discussion on the RAT usedbefore the NR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

For example, the CAM may include dynamic state information of thevehicle such as direction and speed, static data of the vehicle such asa size, and basic vehicle information such as an exterior illuminationstate, route details, or the like. For example, the UE may broadcast theCAM, and latency of the CAM may be less than 100 ms. For example, the UEmay generate the DENM and transmit it to another UE in an unexpectedsituation such as a vehicle breakdown, accident, or the like. Forexample, all vehicles within a transmission range of the UE may receivethe CAM and/or the DENM. In this case, the DENM may have a higherpriority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

For example, based on the vehicle platooning, vehicles may move togetherby dynamically forming a group. For example, in order to perform platoonoperations based on the vehicle platooning, the vehicles belonging tothe group may receive periodic data from a leading vehicle. For example,the vehicles belonging to the group may decrease or increase an intervalbetween the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may besemi-automated or fully automated. For example, each vehicle may adjusttrajectories or maneuvers, based on data obtained from a local sensor ofa proximity vehicle and/or a proximity logical entity. In addition, forexample, each vehicle may share driving intention with proximityvehicles.

For example, based on the extended sensors, raw data, processed data, orlive video data obtained through the local sensors may be exchangedbetween a vehicle, a logical entity, a UE of pedestrians, and/or a V2Xapplication server. Therefore, for example, the vehicle may recognize amore improved environment than an environment in which a self-sensor isused for detection.

For example, based on the remote driving, for a person who cannot driveor a remote vehicle in a dangerous environment, a remote driver or a V2Xapplication may operate or control the remote vehicle. For example, if aroute is predictable such as public transportation, cloud computingbased driving may be used for the operation or control of the remotevehicle. In addition, for example, an access for a cloud-based back-endservice platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2Xscenarios such as vehicle platooning, advanced driving, extendedsensors, remote driving, or the like is discussed in NR-based V2Xcommunication.

SUMMARY OF THE DISCLOSURE Technical Solutions

According to an embodiment, a method of operating a first apparatus 100in a wireless communication system is proposed. The method may comprise:receiving a configured grant from a base station; obtaining a firsthybrid automatic repeat request (HARQ) process identifier (ID) relatedto a first period of the configured grant; transmitting a first physicalsidelink shared channel (PSSCH) to a second apparatus, based on a firstresource included in the first period; obtaining a second HARQ processID related to a second period of the configured grant; and transmittinga second PSSCH to the second apparatus, based on a second resourceincluded in the second period.

Effects of the Disclosure

The user equipment (UE) can efficiently perform SL communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure.

FIG. 3 shows a radio protocol architecture, based on an embodiment ofthe present disclosure.

FIG. 4 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure.

FIG. 5 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure.

FIG. 6 shows an example of a BWP, based on an embodiment of the presentdisclosure.

FIG. 7 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure.

FIG. 8 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure.

FIG. 9 shows three cast types, based on an embodiment of the presentdisclosure.

FIG. 10 shows a method in which a UE that has reserved transmissionresource(s) informs another UE of the transmission resource(s), based onan embodiment of the present disclosure.

FIG. 11 shows an example in which an NDI value is toggled according toan embodiment of the present disclosure.

FIG. 12 shows a procedure in which a first apparatus performs wirelesscommunication, according to an embodiment of the present disclosure.

FIG. 13 shows a procedure in which a second apparatus performs wirelesscommunication, according to an embodiment of the present disclosure.

FIG. 14 shows a communication system 1, based on an embodiment of thepresent disclosure.

FIG. 15 shows wireless devices, based on an embodiment of the presentdisclosure.

FIG. 16 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

FIG. 17 shows another example of a wireless device, based on anembodiment of the present disclosure.

FIG. 18 shows a hand-held device, based on an embodiment of the presentdisclosure.

FIG. 19 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B.” In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(PDCCH)”, it may mean that “PDCCH” is proposed as an example of the“control information”. In other words, the “control information” of thepresent specification is not limited to “PDCCH”, and “PDCCH” may beproposed as an example of the “control information”. In addition, whenindicated as “control information (i.e., PDCCH)”, it may also mean that“PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure. The embodiment of FIG. 2 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 2 , a next generation—radio access network (NG-RAN)may include a BS 20 providing a UE 10 with a user plane and controlplane protocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (layer 1, L1), a second layer (layer 2,L2), and a third layer (layer 3, L3) based on the lower three layers ofthe open system interconnection (OSI) model that is well-known in thecommunication system. Among them, a physical (PHY) layer belonging tothe first layer provides an information transfer service by using aphysical channel, and a radio resource control (RRC) layer belonging tothe third layer serves to control a radio resource between the UE andthe network. For this, the RRC layer exchanges an RRC message betweenthe UE and the BS.

FIG. 3 shows a radio protocol architecture, based on an embodiment ofthe present disclosure. The embodiment of FIG. 3 may be combined withvarious embodiments of the present disclosure. Specifically, (a) of FIG.3 shows a radio protocol stack of a user plane for Uu communication, and(b) of FIG. 3 shows a radio protocol stack of a control plane for Uucommunication. (c) of FIG. 3 shows a radio protocol stack of a userplane for SL communication, and (d) of FIG. 3 shows a radio protocolstack of a control plane for SL communication.

Referring to FIG. 3 , a physical layer provides an upper layer with aninformation transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., a MAC layer, an RLC layer, a packetdata convergence protocol (PDCP) layer, and a service data adaptationprotocol (SDAP) layer) for data delivery between the UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

FIG. 4 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure. The embodiment of FIG. 4 may becombined with various embodiments of the present disclosure.

Referring to FIG. 4 , in the NR, a radio frame may be used forperforming uplink and downlink transmission. A radio frame has a lengthof 10 ms and may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined based on subcarrier spacing (SCS). Each slotmay include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(subframe,u) _(slot)) based on anSCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15 * 2^(u)) N^(slot) _(symb) N^(frame,u) _(slot)N^(subframe,u) _(slot)  15 KHz (u = 0) 14 10 1  30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 16016

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe based on the SCS, ina case where an extended CP is used.

TABLE 2 SCS (15 * 2^(u)) N^(slot) _(symb) N^(frame,u) _(slot)N^(subframe,u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table 3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier Spacing designationfrequency range (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz 

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier Spacing designationfrequency range (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz 

FIG. 5 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure. The embodiment of FIG. 5 may becombined with various embodiments of the present disclosure.

Referring to FIG. 5 , a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH,physical downlink shared channel (PDSCH), or channel stateinformation—reference signal (CSI-RS) (excluding RRM) outside the activeDL BWP. For example, the UE may not trigger a channel state information(CSI) report for the inactive DL BWP. For example, the UE may nottransmit physical uplink control channel (PUCCH) or physical uplinkshared channel (PUSCH) outside an active UL BWP. For example, in adownlink case, the initial BWP may be given as a consecutive RB set fora remaining minimum system information (RMSI) control resource set(CORESET) (configured by physical broadcast channel (PBCH)). Forexample, in an uplink case, the initial BWP may be given by systeminformation block (SIB) for a random access procedure. For example, thedefault BWP may be configured by a higher layer. For example, an initialvalue of the default BWP may be an initial DL BWP. For energy saving, ifthe UE fails to detect downlink control information (DCI) during aspecific period, the UE may switch the active BWP of the UE to thedefault BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. For example, the UE may receive a configuration for theUu BWP from the BS/network. The SL BWP may be (pre-)configured in acarrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE.For the UE in the RRC_CONNECTED mode, at least one SL BWP may beactivated in the carrier.

FIG. 6 shows an example of a BWP, based on an embodiment of the presentdisclosure. The embodiment of FIG. 6 may be combined with variousembodiments of the present disclosure. It is assumed in the embodimentof FIG. 6 that the number of BWPs is 3.

Referring to FIG. 6 , a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

A sidelink synchronization signal (SLSS) may include a primary sidelinksynchronization signal (PSSS) and a secondary sidelink synchronizationsignal (SSSS), as an SL-specific sequence. The PSSS may be referred toas a sidelink primary synchronization signal (S-PSS), and the SSSS maybe referred to as a sidelink secondary synchronization signal (S-SSS).For example, length-127 M-sequences may be used for the S-PSS, andlength-127 gold sequences may be used for the S-SSS. For example, a UEmay use the S-PSS for initial signal detection and for synchronizationacquisition. For example, the UE may use the S-PSS and the S-SSS foracquisition of detailed synchronization and for detection of asynchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit cyclic redundancy check (CRC).

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 7 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure. The embodiment of FIG. 7 may becombined with various embodiments of the present disclosure.

Referring to FIG. 7 , in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit an SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIG. 8 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure. The embodiment of FIG. 8 may be combined with variousembodiments of the present disclosure. In various embodiments of thepresent disclosure, the transmission mode may be called a mode or aresource allocation mode. Hereinafter, for convenience of explanation,in LTE, the transmission mode may be called an LTE transmission mode. InNR, the transmission mode may be called an NR resource allocation mode.

For example, (a) of FIG. 8 shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, (a) of FIG. 8 shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, (b) of FIG. 8 shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, (b) of FIG. 8 shows a UE operation related to an NR resourceallocation mode 2.

Referring to (a) of FIG. 8 , in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule an SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g.,Configured Grant Type 1 or Configured Grant Type 2), and the UE 1 mayperform V2X or SL communication with respect to a UE 2 according to theresource scheduling. For example, the UE 1 may transmit a sidelinkcontrol information (SCI) to the UE 2 through a physical sidelinkcontrol channel (PSCCH), and thereafter transmit data based on the SCIto the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to (b) of FIG. 8 , in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine an SL transmission resource within an SL resource configuredby a BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIG. 9 shows three cast types, based on an embodiment of the presentdisclosure. The embodiment of FIG. 9 may be combined with variousembodiments of the present disclosure. Specifically, (a) of FIG. 9 showsbroadcast-type SL communication, (b) of FIG. 9 shows unicast type-SLcommunication, and (c) of FIG. 9 shows groupcast-type SL communication.In case of the unicast-type SL communication, a UE may performone-to-one communication with respect to another UE. In case of thegroupcast-type SL transmission, the UE may perform SL communication withrespect to one or more UEs in a group to which the UE belongs. Invarious embodiments of the present disclosure, SL groupcastcommunication may be replaced with SL multicast communication, SLone-to-many communication, or the like.

Meanwhile, in various embodiments of the present disclosure, atransmitting UE (i.e., TX UE) may be a UE which transmits data to(target) receiving UE(s) (i.e., RX UE(s)). For example, the TX UE may bea UE which performs PSCCH transmission and/or PSSCH transmission. Forexample, the TX UE may be a UE which transmits SL CSI-RS(s) and/or a SLCSI report request indication to (target) RX UE(s). For example, the TXUE may be a UE which transmits a (pre-defined) reference signal(s)(e.g., PSSCH demodulation reference signal (DM-RS)) and/or SL (L1) RSRPreport request indicator, which is/are used for SL (L1) RSRPmeasurement, to (target) to RX UE(s). For example, the TX UE may be a UEwhich transmits a (control) channel (e.g., PSCCH, PSSCH, etc.) and/orreference signal(s) (e.g., DM-RS(s), CSI-RS(s), etc.) through the(control) channel, which is/are used for SL radio link monitoring (RLM)operation(s) and/or SL radio link failure (RLF) operation(s) of (target)RX UE(s).

Meanwhile, in various embodiments of the present disclosure, a receivingUE (i.e., RX UE) may be a UE which transmits SL HARQ feedback totransmitting UE(s) (i.e., TX UE(s)), based on whether or not datatransmitted by TX UE(s) is decoded successfully and/or whether or not aPSCCH (related to PSSCH scheduling) transmitted by TX UE(s) isdetected/decoded successfully. For example, the RX UE may be a UE whichperforms SL CSI transmission to TX UE(s) based on SL CSI-RS(s) and/or aSL CSI report request indication received from TX UE(s). For example,the RX UE may be a UE which transmits, to TX UE(s), an SL (L1) RSRPmeasurement value measured based on (pre-defined) reference signal(s)and/or SL (L1) RSRP report request indication received from TX UE(s).For example, the RX UE may be a UE which transmits its own data to TXUE(s). For example, the RX UE may be a UE which performs SL RLMoperation(s) and/or SL RLF operation(s) based on a (pre-configured)(control) channel and/or reference signal(s) through the (control)channel received from TX UE(s).

Meanwhile, in various embodiments of the present disclosure, when areceiving UE transmits SL HARQ feedback information for a PSSCH and/or aPSCCH received from a transmitting UE, the following method may beconsidered or partly considered. Here, for example, the correspondingscheme or some schemes may be limitedly applied only when a receiving UEsuccessfully decodes/detects a PSCCH for scheduling a PSSCH.

-   -   Option 1: transmit NACK information only when PSSCH        decoding/reception fails    -   Option 2: transmit ACK information when PSSCH decoding/reception        is successful, or transmit NACK information when fails

Meanwhile, in various embodiments of the present disclosure, forexample, a TX UE may transmit at least one of the following informationto an RX UE through SCI. Here, for example, a TX UE may transmit atleast one of the following information to an RX UE through first SCIand/or second SCI.

-   -   PSSCH (and/or PSCCH) related resource allocation information        (e.g., location/number of time/frequency resources, resource        reservation information (e.g., period))    -   SL CSI report request indicator or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) report request indicator    -   (on PSSCH) SL CSI transmission indicator (or SL (L1) RSRP        (and/or SL (L1) RSRQ and/or SL (L1) RSSI) information        transmission indicator)    -   Modulation and Coding Scheme (MCS) information    -   transmission power information    -   L1 destination ID information and/or L1 source ID information    -   SL HARQ process ID information    -   new data indicator (NDI) information    -   redundancy version (RV) information    -   (transmission traffic/packet related) QoS information (e.g.,        priority information)    -   SL CSI-RS transmission indicator or the number of (transmitted)        SL CSI-RS antenna ports information    -   location information of TX UE or location (or distance region)        information of a target RX UE (where SL HARQ feedback is        required)    -   information on decoding of data transmitted through PSSCH and/or        a reference signal (e.g., DM-RS, etc.) related to channel        estimation. For example, the information on a reference signal        may be information related to the pattern of the        (time-frequency) mapping resource of a DM-RS, RANK information,        antenna port index information, etc.

Meanwhile, in various embodiments of the present disclosure, forexample, a PSCCH may be replaced/substituted with at least one of a SCI,a first SCI (1^(st)-stage SCI), and/or a second SCI (2^(nd)-stage SCI),or vice versa. For example, a SCI may be replaced/substituted with atleast one of a PSCCH, a first SCI, and/or a second SCI, or vice versa.For example, a PSSCH may be replaced/substituted with a second SCIand/or a PSCCH, or vice versa, since a transmitting UE may transmitsecond SCI to a receiving UE through PSSCH. for example, if SCIconfiguration fields are divided into two groups in consideration of a(relatively) high SCI payload size, an SCI including a first SCIconfiguration field group may be referred to as a first SCI or a 1^(st)SCI, and an SCI including a second SCI configuration field group may bereferred to as a second SCI or a 2^(nd) SCI. For example, the 1^(st) SCIand the 2^(nd) SCI may be transmitted through different channels. Forexample, the transmitting UE may transmit the first SCI to the receivingUE through the PSCCH. For example, the second SCI may be transmitted tothe receiving UE through an (independent) PSCCH, or may be transmittedin a piggyback manner together with data through the PSSCH.

On the other hand, in various embodiments of the present disclosure, forexample, “configuration” or “definition” may mean (resource poolspecific) (pre-)configuration (through predefined signaling (e.g., SIB,MAC, RRC, etc.)) from a base station or a network. For example, “A isconfigured” may mean “a base station/network transmits informationrelated to A to a UE”. Or, for example, “A is configured” may mean “A isdesignated through pre-defined signaling (e.g., PC5 RRC) between UEs”.

Meanwhile, in various embodiments of the present disclosure, forexample, “RLF” may be interpreted as mutually extended to at least oneof out of synch (OOS) and in synch (IS). Meanwhile, in variousembodiments of the present disclosure, for example, a resource block(RB) may be replaced/substituted with a subcarrier, or vice versa. Forexample, a packet or a traffic may be replaced/substituted with atransport block (TB) or a medium access control protocol data unit (MACPDU) according to a transmission layer, or vice versa. For example, acode block group (CBG) may be replaced/substituted with a TB, or viceversa. For example, a source ID may be replaced/substituted with adestination ID, or vice versa. For example, an L1 ID may bereplaced/substituted with an L2 ID, or vice versa. For example, the L1ID may be an L1 source ID or an L1 destination ID. For example, the L2ID may be an L2 source ID or an L2 destination ID.

Meanwhile, in various embodiments of the present disclosure, forexample, operation(s) of a TX UE to reserve/select/determineretransmission resource(s) may include operation(s) of the TX UE toreserve/select/determine potential retransmission resource(s) in whichactual use is determined based on SL HARQ feedback information receivedfrom RX UE(s).

Meanwhile, in various embodiments of the present disclosure, asub-selection window may be replaced/substituted with a selection windowand/or a pre-configured number of resource sets within the selectionwindow, or vice versa.

Meanwhile, in various embodiments of the present disclosure, SL MODE 1may refer to a resource allocation method or a communication method inwhich a base station directly schedules SL transmission resource(s) fora TX UE through pre-defined signaling (e.g., DCI or RRC message). Forexample, SL MODE 2 may refer to a resource allocation method or acommunication method in which a UE independently selects SL transmissionresource(s) in a resource pool pre-configured or configured from a basestation or a network. For example, a UE performing SL communicationbased on SL MODE 1 may be referred to as a MODE 1 UE or MODE 1 TX UE,and a UE performing SL communication based on SL MODE 2 may be referredto as a MODE 2 UE or MODE 2 TX UE.

Meanwhile, in the present disclosure, for example, a dynamic grant (DG)may be replaced/substituted with a configured grant (CG) and/or asemi-persistent scheduling (SPS) grant, or vice versa. For example, theDG may be replaced/substituted with a combination of the CG and the SPSgrant, or vice versa. For example, the CG may include at least one of aconfigured grant (CG) type 1 and/or a configured grant (CG) type 2. Forexample, in CG type 1, the grant may be provided by RRC signaling andmay be stored as a configured grant. For example, in CG type 2, a grantmay be provided by PDCCH, it may be stored or deleted as a configuredgrant based on L1 signaling indicating activation or deactivation of thegrant. For example, in CG type 1, a base station may allocate a periodicresource to a TX UE through an RRC message. For example, in CG type 2, abase station may allocate a periodic resource to a TX UE through an RRCmessage, and a base station may dynamically activate or deactivate aperiodic resource through DCI.

Meanwhile, in various embodiments of the present disclosure, a channelmay be replaced/substituted with a signal, or vice versa. For example,transmission/reception of a channel may include transmission/receptionof a signal. For example, transmission/reception of a signal may includetransmission/reception of a channel. For example, cast may bereplaced/substituted with at least one of unicast, groupcast, and/orbroadcast, or vice versa. For example, a cast type may bereplaced/substituted with at least one of unicast, groupcast, and/orbroadcast, or vice versa.

Meanwhile, in various embodiments of the present disclosure, a resourcemay be replaced/substituted with a slot or a symbol, or vice versa. Forexample, the resource may include a slot and/or a symbol.

Meanwhile, in various embodiments of the present disclosure, a prioritymay be replaced/substituted with at least one of logical channelprioritization (LCP), latency, reliability, minimum requiredcommunication range, prose per-packet priority (PPPP), sidelink radiobearer (SLRB), a QoS profile, a QoS parameter, and/or requirement, orvice versa.

Meanwhile, in various embodiments of the present disclosure, forexample, for convenience of description, a (physical) channel used whena RX UE transmits at least one of the following information to a TX UEmay be referred to as a PSFCH.

-   -   SL HARQ feedback, SL CSI, SL (L1) RSRP

Meanwhile, when performing sidelink communication, a method for atransmitting UE to reserve or pre-determine transmission resource(s) forreceiving UE(s) may be representatively as follows.

For example, the transmitting UE may perform a reservation oftransmission resource(s) based on a chain. Specifically, for example, ifthe transmitting UE reserves K transmission resources, the transmittingUE may transmit location information for less than K transmissionresources to receiving UE(s) through a SCI transmitted to the receivingUE(s) at any (or specific) transmission time or a time resource. Thatis, for example, the SCI may include location information for less thanthe K transmission resources. Alternatively, for example, if thetransmitting UE reserves K transmission resources related to a specificTB, the transmitting UE may transmit location information for less thanK transmission resources to receiving UE(s) through a SCI transmitted tothe receiving UE(s) at any (or specific) transmission time or a timeresource. That is, the SCI may include location information for lessthan the K transmission resources. In this case, for example, it ispossible to prevent performance degradation due to an excessive increasein payloads of the SCI, by signaling only the location information forless than K transmission resources to the receiving UE(s) through oneSCI transmitted at any (or specific) transmission time or the timeresource by the transmitting UE.

FIG. 10 shows a method in which a UE that has reserved transmissionresource(s) informs another UE of the transmission resource(s), based onan embodiment of the present disclosure. The embodiment of FIG. 10 maybe combined with various embodiments of the present disclosure.

Specifically, for example, (a) of FIG. 10 shows a method for performingby a transmitting UE chain-based resource reservation bytransmitting/signaling location information of (maximum) 2 transmissionresources to receiving UE(s) through one SCI, in the case of a value ofK=4. For example, (b) of FIG. 10 shows a method for performing by atransmitting UE chain-based resource reservation bytransmitting/signaling location information of (maximum) 3 transmissionresources to receiving UE(s) through one SCI, in the case of a value ofK=4. For example, referring to (a) and (b) of FIG. 10 , the transmittingUE may transmit/signal only location information of the fourthtransmission-related resource to the receiving UE(s) through the fourth(or last) transmission-related PSCCH. For example, referring to (a) ofFIG. 10 , the transmitting UE may transmit/signal to the receiving UE(s)not only location information of the fourth transmission-relatedresource but also location information of the third transmission-relatedresource additionally through the fourth (or last) transmission-relatedPSCCH. For example, referring to (b) of FIG. 10 , the transmitting UEmay transmit/signal to the receiving UE(s) not only location informationof the fourth transmission-related resource but also locationinformation of the second transmission-related resource and locationinformation of the third transmission-related resource additionallythrough the fourth (or last) transmission-related PSCCH. In this case,for example, in (a) and (b) of FIG. 10 , if the transmitting UE maytransmit/signal to the receiving UE(s) only location information of thefourth transmission-related resource through the fourth (or last)transmission-related PSCCH, the transmitting UE may configure ordesignate a field/bit of location information of unused or remainingtransmission resource(s) to a pre-configured value (e.g., 0). Forexample, in (a) and (b) of FIG. 10 , if the transmitting UE maytransmit/signal to the receiving UE(s) only location information of thefourth transmission-related resource through the fourth (or last)transmission-related PSCCH, the transmitting UE may be configured ordesignate a field/bit of location information of unused or remainingtransmission resource(s) to a pre-configured status/bit valueindicating/representing the last transmission (among 4 transmissions).

Meanwhile, for example, the transmitting UE may perform a reservation oftransmission resource(s) based on a block. Specifically, for example, ifthe transmitting UE reserves K transmission resources, the transmittingUE may transmit location information for K transmission resources toreceiving UE(s) through a SCI transmitted to the receiving UE(s) at any(or specific) transmission time or a time resource. That is, the SCI mayinclude location information for K transmission resources. For example,if the transmitting UE reserves K transmission resources related to aspecific TB, the transmitting UE may transmit location information for Ktransmission resources to receiving UE(s) through a SCI transmitted tothe receiving UE(s) at any (or specific) transmission time or a timeresource. That is, the SCI may include location information for Ktransmission resources. For example, (c) of FIG. 10 shows a method forperforming by the transmitting UE block-based resource reservation, bysignaling location information of 4 transmission resources to receivingUE(s) through one SCI, in the case of a value of K=4.

According to an embodiment of the present disclosure, when a mode (MODE)1 UE performs TB transmission using an SL resource within a specific CGperiod, and/or when it performs TB transmission using SL retransmissionresources additionally allocated through mode 1 DG downlink controlinformation (DCI), linked with SL resources within a specific CG period,whether to toggling a new data indicator (NDI) on the SCI related to TBtransmission may be configured to be determined according to the (partof) following rules. For example, the TB transmission may be an initialtransmission or a retransmission. And, for example, it may be determinedwhether to designate an NDI value and/or designate/change an SL HARQPROCESS ID according to the (part of) following rules. For example, inthe present disclosure, SL HARQ PROCESS ID may mean SL PROCESS ID.

According to an embodiment of the present disclosure, when a CG periodis changed, an NDI value on TB-related SCI transmitted through a(changed) “SL resource interlocked with a CG period (REL_CGRSC)” may betoggled. For example, (option 1-A) toggling an NDI value may be togglingcompared to an NDI value on REL_CGRSC-related SCI of the previous CGperiod. Or, for example, (option 1-B) toggling an NDI value may betoggling compared to an NDI value on the previous nearest REL_CGRSCrelated SCI where an actual TB transmission was performed. For example,in the present disclosure, “REL_CGRSC” may be interpreted (limitedly) asa CG resource configured within a CG period and/or an SL retransmissionresource additionally allocated through mode 1 DG DCI linked with a CGresource configured within a CG period. For example, in the presentdisclosure, only one TB transmission is possible through REL_CGRSC, inaddition, it may be assumed that different TB transmissions areperformed between different REL_CGRSCs. For example, in the Option 1-Ascheme (and/or Option 1-B scheme) above, a change of CG periods of thepre-configured number of times may be interpreted as a factor fortoggling an NDI value on SCI. For example, when applying the rules ofOption 1-A and/or Option 1-B above, if different TB transmissions areperformed using REL_CGRSC with different HARQ PROCESS IDs (HPN_DCI), SLHARQ PROCESS ID (HPN_SCI) designated on REL_CGRSC-related SCI ofdifferent HPN_DCI may be mapped/specified differently (e.g., one-to-onemapping). For example, a HARQ PROCESS ID may be derived through apredefined formula. For example, the predefined formula may includeEquation 1 below.HARQ Process ID=[floor(CURRENT_slot/sl-PeriodCG)] modulosl-NrOfHARQ-Processes+sl-HARQ-ProcID-offset  [Equation 1]

For example, HPN_DCI may be used to indicate linkage between a CGresource configured within a CG period and an SL retransmission resourceadditionally allocated through mode 1 DG DCI. For example, the HPN_DCImay be signaled through a predefined field on the mode 1 DG DCI.

According to an embodiment of the present disclosure, NDI values ondifferent TB-related SCIs transmitted through REL_CGRSC related todifferent CG periods may be determined differently according to amapping method between “REL_CGRSC-related HPN_DCI” and “HPN_SCI onTB-related SCI transmitted using (corresponding) REL_CGRSC”. Forexample, whether the NDI values on the different TB-related SCIs areTOGGLED may also be determined differently according to a mapping methodbetween the HPN_DCI and the HPN_SCI. For example, NDI values ondifferent TB-related SCIs transmitted through REL_CGRSC having differentHPN_DCI to which the same HPN_SCI value is mapped may be configured tobe toggled. For example, NDI values on different TB-related SCIstransmitted through REL_CGRSC with different HPN_DCIs to which differentHPN_SCI values are mapped may be configured not to be toggled, or to beuntoggled. For example, a rule in which NDI values on differentTB-related SCIs are determined according to the above-described mappingmethod between HPN_DCI and HPN_SCI may be limitedly applied only when aPUCCH resource is not configured (or configured) for a mode 1 CGresource. For example, the PUCCH resource may be for the purpose ofrequesting additional retransmission resources. For example, when thesame HPN_SCI value is mapped to a plurality of REL_CGRSCs havingdifferent HPN_DCIs, a UE may not expect that a mode 1 CG resourcerelated PUCCH resource is configured.

According to an embodiment of the present disclosure, depending onwhether a PUCCH resource is configured for a mode 1 CG resource, themapping method between allowed “REL_CGRSC-related HPN_DCI” and “HPN_SCIon TB-related SCI transmitted using (corresponding) REL_CGRSC” may beconfigured differently. Here, for example, when a PUCCH resource isconfigured, HPN_SCI designated on REL_CGRSC-related SCI of differentHPN_DCI may be mapped/specified differently (e.g., one-to-one mapping).On the other hand, for example, if a PUCCH resource is not configured,on REL_CGRSC-related SCIs of different HPN_DCIs, HPN_SCImapping/designation of the same value (e.g., many to one mapping) may beallowed.

According to an embodiment of the present disclosure, REL_CGRSC untilREL_CGRSC of HPN_DCI #X reappears, for example, from REL_CGRSC relatedto CG period of HPN_DCI #X to REL_CGRSC related to CG period of HPN_DCI#(X+HPNDCI_NUM−1), all NDI values on the related SCI may be configuredto have the same toggling state (and/or value). Here, for example, X maybe a pre-configured value (e.g., 0). For example, from a REL_CGRSCrelated to a CG period of HPN_DCI #X that reappeared after a CG periodof HPN_DCI #(X+HPNDCI_NUM−1), to a REL_CGRSC relative to a CG period ofHPN_DCI #(X+HPNDCI_NUM−1), an NDI value on related SCI may be toggled(vs. before). Here, for example, “HPNDCI_NUM” may mean the (maximum)number of (SL) HARQ PROCESS (IDs) configured for a mode 1 CG resource.For example, the (maximum) number of the (SL) HARQ PROCESS (ID) may meanthe (maximum) number of HPN_SCIs or the (maximum) number of HPN_DCIs.

FIG. 11 shows an example in which an NDI value is toggled according toan embodiment of the present disclosure. The embodiment of FIG. 11 maybe combined with various embodiments of the present disclosure.

Referring to FIG. 11 , in the first CG period, HPN_DCI may be HPN_DCI#A. For example, in the first CG period, REL_CGRSC-related HPN_SCI ofHPN_DCI #A may be HPN_SCI #a. For example, in FIG. 11 , HPN_DCI andHPN_SCI may have a one-to-one mapping relationship in each CG period.For example, an NDI value on REL_CGRSC related SCI of HPN_DCI #A in thefirst CG period may be 0 or 1. For example, the HPN_DCI #A may bedetermined based on a first resource among three resources included inthe REL_CGRSC of the first CG period. For example, a first TB may beinitially transmitted to a receiving UE based on one of three resourcesincluded in the REL_CGRSC of the first CG period.

For example, HPN_DCI related to DCI-based DG resource related toretransmission of a first TB initially transmitted in the first CGperiod of FIG. 11 may be HPN_DCI #A. And, HPN_SCI related to the DGresource may be HPN_SCI #a. That is, even if a CG period is changed,HPN_DCI and HPN_SCI related to resources related to retransmission ofthe first TB may be maintained the same. For example, HPN_DCI related tothe DG resource may be indicated through the DCI. And, for example, anNDI value on the SCI related to the retransmission of the first TB maybe the same as the NDI value on the SCI related to the initialtransmission. That is, for example, since the NDI value on the REL_CGRSCrelated SCI of HPN_DCI #A in the first CG period is 0 or 1, the NDIvalue on the SCI related to the retransmission of the initiallytransmitted first TB in FIG. 11 may be: 0 if the NDI value on theREL_CGRSC related SCI of HPN_DCI #A is 0; Or, 1 if the NDI value on theREL_CGRSC related SCI of HPN_DCI #A is 1.

For example, in the second CG period and/or the fourth CG period in FIG.11 , HPN_DCI may be determined based on the first resource among threeresources included in each REL_CGRSC. For example, HPN_DCI of the secondCG period may be HPN_DCI #B, and HPN_DCI of the fourth CG period may beHPN_DCI #X. And, HPN_DCI #B, HPN_DCI #X REL_CGRSC-related HPN_SCI ofeach may be HPN_SCI #b, HPN_SCI #x, and as described above, HPN_SCI #band HPN_SCI #x may have a one-to-one mapping relationship with HPN_DCI#B and HPN_DCI #X, respectively.

For example, in the fifth CG period of FIG. 11 , HPN_DCI determinedbased on the first resource among three resources included in REL_CGRSCis HPN_DCI #A, it may be equal to HPN_DCI #A related to the first CGperiod. For example, in this case, in the fifth CG period due to theone-to-one mapping relationship, HPN_SCI related to HPN_DCI #A may beHPN_SCI #a. In this case, for example, retransmission of the first TBinitially transmitted in the first CG period cannot be performed anymore. In the fifth CG period, a second TB may be initially transmitted.Here, when the initial transmission of the second TB is transmitted tothe same receiving UE that received the first TB, an NDI value on SCIrelated to the second TB may be a value toggled from the NDI value onthe SCI related to the retransmission of the first TB. For example, whenthe NDI value on the SCI related to the retransmission of the first TBis 0, the NDI value on the SCI related to the second TB may be 1, orwhen the NDI value on the SCI related to the retransmission of the firstTB is 1, the NDI value on the SCI related to the second TB may be 0.

According to an embodiment of the present disclosure, an NDI value onREL_CGRSC related SCI of HPN_DCI #Y may be toggled (compared to theprevious one) when REL_CGRSC of the same HPN_DCI #Y appears again. Here,for example, the NDI value may be toggled (compared to the previous one)when a REL_CGRSC of the same HPN_DCI #Y reappears a pre-configurednumber of times. For example, a rule related to the reappearance ofREL_CGRSC of HPN_DCI #Y may be independently applied/operated for eachREL_CGRSC of different HPN_DCI.

According to an embodiment of the present disclosure, when a(pre-configured) timer value related to HPN_DCI #Z expires, an NDI valueon a REL_CGRSC related SCI of HPN_DCI #Z may be toggled (compared to theprevious one). Here, for example, a timer value of HPN_DCI #Z may mean atime during which a UE can expect DG DCI reception for allocatingadditional retransmission resources related to HPN_DCI #Z from a basestation. Also, for example, when a timer value related to HPN_DCI #Zexpires, a new transport block (TB) (compared to the previous)transmission may be performed through an HPN_DCI #Z related REL_CGRSC.For example, when a new TB transmission is performed, a UE may perform anew TB transmission after flushing a HPN_DCI #Z related buffer/MAC PDU.

According to an embodiment of the present disclosure, when TBtransmission is performed through REL_CGRSC related to a specific CGperiod, whether to toggle an NDI on relevant SCI, designation of an NDIvalue, designation of an HPN_SCI value, and/or designation of an L1 ID(e.g., source/destination ID) may be made to be determined by a UEimplementation.

According to an embodiment of the present disclosure, when a mode 1 UEperforms TB transmission through REL_CGRSC related to a specific CGperiod, whether to toggle an NDI on relevant SCI, designation of an NDIvalue, and/or designation of an HPN_SCI value may be determinedaccording to (a part of) the rules below.

For example, when a TX UE performs different TB transmissions withrespect to the same target RX UE (and/or an RX UE related to the samesession, and/or an RX UE related to the same cast type), using differentCG period-related REL_CGRSC (and/or when a TX UE uses the same L1 (orL2) source ID and L1 (or L2) destination ID to perform different TBtransmissions through different CG period-related REL_CGRSC), onREL_CGRSC-related SCIs of different CG periods, different HPN_SCI values(and/or the same (or different) NDI values) may be designated.

For example, when a TX UE performs different TB transmissions fordifferent target RX UEs (and/or an RX UE related to the same session,and/or an RX UE related to the same cast type) by using different CGperiod-related REL_CGRSC (and/or when a TX UE uses the same L1 (or L2)source ID and L1 (or L2) destination ID to perform different TBtransmissions through different CG period-related REL_CGRSC), inREL_CGRSC-related SCI of different CG periods, an HPN_SCI value and anNDI value may be identically (or differently) designated (or an HPN_SCIvalue may be designated as the same (or different), and an NDI value maybe designated as different (or the same)).

For example, when a TX UE performs (TB) retransmission for the sametarget RX UE (and/or an RX UE related to the same session, and/or an RXUE related to the same cast type) by using REL_CGRSC related to aspecific CG period (and/or when a TX UE performs retransmission (e.g.,retransmission of TB) using the same L1 (or L2) source ID and L1 (or L2)destination ID), an HPN_SCI value and an NDI value may be identicallydesignated on SCI.

According to an embodiment of the present disclosure, during mode 1 CGoperation, when TB transmission is performed through retransmissionresources (ADD_RRSC) additionally allocated through DG DCI, an NDI valueon related SCI may be designated according to the rule below. Forexample, during mode 1 CG operation, when TB transmission is performedthrough a retransmission resource (ADD_RRSC) additionally allocatedthrough DG DCI, whether to toggle NDI may also be determined accordingto the rule below.

For example, an NDI value on REL_CGRSC (LINK_CGRSC) related SCI (e.g.,of a specific CG period) linked with ADD_RRSC may be configured to beused/maintained in the same way in an NDI on the ADD_RRSC related SCI.Here, for example, LINK_CGRSC may be derived through information such asCG index and/or HPN_DCI on the DG DCI scheduling ADD_RRSC, etc.

According to an embodiment of the present disclosure, a mode 1 UE may beconfigured to report the (part of) following information to a (serving)base station through predefined signaling. For example, the predefinedsignaling may include an RRC message and/or a medium access control(MAC) control element (CE).

-   -   A mapping relationship between “REL_CGRSC related HPN_DCI” and        “HPN_SCI on SCI related to a TB transmitted through        (corresponding) REL_CGRSC    -   Target (receiving) UE/group information where “REL_CGRSC related        HPN_DCI (or HPN_DCI related REL_CGRSC)” is used (e.g., (L1 or        L2) ID of a destination UE)    -   Session-related information (e.g., session ID/index)    -   Service-related information (e.g., application ID)    -   Information related to service priority (and/or requirement)    -   Information related to a cast type (e.g. unicast, groupcast,        broadcast)    -   Information related to a Mode 1 UE itself (e.g., C-RNTI, source        (L1 or L2) ID)

Table 5 shows a procedure for flushing a HARQ buffer of a sidelinkprocess.

[Table 5]

The MAC entity shall for each PSSCH duration:

-   -   1> for each sidelink grant occurring in this PSSCH duration:        -   2> if the configured sidelink grant has been activated and            this PSSCH duration corresponds to the first PSSCH            transmission opportunity within this sl-PeriodCG of the            configured sidelink grant:            -   3> set the HARQ Process ID to the HARQ Process ID                associated with this PSSCH duration and, if available,                all subsequent PSSCH duration(s) occuring in this                sl-PeriodCG for the configured sidelink grant;            -   3> determine that this PSSCH duration is used for                initial transmission;            -   3> flush the HARQ buffer of Sidelink process associated                with the HARQ Process ID.                For configured sidelink grants, the HARQ Process ID                associated with the first slot of a SL transmission is                derived from the following equation:                HARQ Process ID=[floor(CURRENT_slot/PeriodicitySL)]                modulo sl-NrOfHARQ-Processes+sl-HARQ-ProcID-offset

Referring to Table 5, with respect to a sidelink grant occurring withina PSSCH period, when a configured sidelink grant is activated, and whena sidelink grant occurring within a PSSCH period corresponds to thefirst PSSCH transmission opportunity in a sidelink CG period of theconfigured sidelink grant, a MAC layer of a UE in each PSSCH duration:i) may configure a HARQ process ID as a HARQ process ID related to thePSSCH period, and if possible, may also configure HARQ process IDsrelated to all subsequent PSSCH sections occurring within the sidelinkCG period for the configured sidelink grant as HARQ process IDs relatedto the PSSCH section, ii) may determine that the PSSCH period is usedfor initial transmission, iii) may flush a HARQ buffer of a sidelinkprocess related to the HARQ process ID. For example, in the configuredsidelink grant, a HARQ process ID related to the first slot of SLtransmission may be determined based on the above equation.

Table 6 shows a procedure for toggling NDI.

TABLE 6 For each sidelink grant, the Sidelink HARQ Entity shall:   1>ifthe MAC entity determines that the sidelink grant is used for   initialtransmission as specified in clause 5.22.1.1;   or   1>if the sidelinkgrant is a configured sidelink grant and no   MAC PDU has been obtainedin a sl-PeriodCG of the configured   sidelink grant:  NOTE 1: Void.   2>(re-)associate a Sidelink process to this grant, and for the  associated Sidelink process:  NOTE 1A: The Sidelink HARQ Entity willassociate the selected  sidelink grant to the Sidelink processdetermined by the MAC entity.   3> obtain the MAC PDU to transmit fromthe Multiplexing and   assembly entity, if any;   3> if a MAC PDU totransmit has been obtained:    4> if a HARQ Process ID has been set forthe sidelink grant:     5> (re-)associate the HARQ Process IDcorresponding to the     sidelink grant to the Sidelink process;  NOTE1a: There is one-to-one mapping between a HARQ Process  ID and aSidelink process in the MAC entity configured with  Sidelink resourceallocation mode 1.    4> determines Sidelink transmission information ofthe TB for    the source and destination pair of the MAC PDU as follows:    5> set the Source Layer-1 ID to the 8 LSB of the Source     Layer-2ID of the MAC PDU;     5> set the Destination Layer-1 ID to the 16 LSBof the     Destination Layer-2 ID of the MAC PDU;     5> (re-)associatethe Sidelink process to a Sidelink process     ID;  NOTE 1b: How UEdetermine Sidelink process ID in SCI is left to  UE implementation forNR sidelink.     5> consider the NDI to have been toggled compared tothe     value of the previous transmission corresponding to the    Sidelink identification information and the Sidelink process     IDof the MAC PDU and set the NDI to the toggled value;

Referring to FIG. 6 , for each sidelink grant, when a sidelink grant isa configured sidelink grant and a MAC PDU is not obtained within asidelink CG period of the configured sidelink grant, a sidelink HARQentity may associate a sidelink process with this grant. And, for theassociated sidelink process, the sidelink HARQ entity may obtain a MACPDU to be transmitted, and if a HARQ process ID for the sidelink grantis configured, it may associate the sidelink process with the HARQprocess ID for the sidelink grant. In addition, the sidelink HARQ entitymay determine sidelink transmission information of a TB for asource/destination pair of the MAC PDU, it may i) configure an L1 sourceID to 8 LSB of an L2 source ID of a MAC PDU, ii) configure an L1destination ID to 16 LSB of an L2 destination ID of a MAC PDU, iii)associate the sidelink process with a sidelink process ID, iv) comparethe sidelink identification information with a value of the previous(same) transmission corresponding to a sidelink process ID of a MAC PDU,and considers it a toggled NDI, and may configure an NDI to the toggledvalue.

FIG. 12 shows a procedure in which a first apparatus performs wirelesscommunication, according to an embodiment of the present disclosure. Theembodiment of FIG. 12 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 12 , in step S1210, a first apparatus may receive aconfigured grant from a base station. In step S1220, the first apparatusmay obtain a first hybrid automatic repeat request (HARQ) processidentifier (ID) related to a first period of the configured grant. Instep, S1230, the first apparatus may transmit a first physical sidelinkshared channel (PSSCH) to a second apparatus, based on a first resourceincluded in the first period. In step S1240, the first apparatus mayobtain a second HARQ process ID related to a second period of theconfigured grant. For example, the second HARQ process ID related to thesecond period may be the same as the first HARQ process ID. In stepS1250, the first apparatus may transmit a second PSSCH to the secondapparatus, based on a second resource included in the second period. Forexample, a new data indicator (NDI) related to the second PSSCH may be avalue to which a NDI related to the first PSSCH is toggled, based on thesecond HARQ process ID which is the same as the first HARQ process ID.

For example, the first HARQ process ID may be mapped one-to-one with afirst sidelink (SL) process ID related to the first PSSCH.

For example, the first HARQ process ID may be mapped one-to-one with thefirst SL process ID, based on that a resource related to a physicaluplink control channel (PUCCH) related to the first PSSCH is configured.

For example, the first SL process ID may be included in first sidelinkcontrol information (SCI) related to the first PSSCH.

For example, SL identification information of the first apparatusrelated to the first PSSCH may be the same as SL identificationinformation of the first apparatus related to the second PSSCH.

For example, a first SL process ID related to the first PSSCH may be thesame as a second SL process ID related to the second PSSCH.

For example, additionally, the first apparatus may receive a dynamicgrant including a third resource related to the first HARQ process IDfrom the base station; and retransmit the first PSSCH to the secondapparatus, based on the third resource.

For example, an NDI related to the retransmitted first PSSCH may be thesame as the NDI related to the first PSSCH.

For example, a third SL process ID related to the retransmitted firstPSSCH may be the same as a first SL process ID related to the firstPSSCH.

For example, additionally, the first apparatus may flush a bufferrelated to the second HARQ process ID, based on that the second HARQprocess ID is the same as the first HARQ process ID.

For example, the buffer related to the second HARQ process ID may beflushed based on expiration of a timer related to the second HARQprocess ID.

For example, additionally, the first apparatus may report a mappingrelationship related to the first HARQ process ID and a first SL processID related to the first PSSCH.

For example, the mapping relationship may be reported through a radioresource control (RRC) message or a medium access control (MAC) controlelement (CE).

The above-described embodiment may be applied to various devices to bedescribed below. For example, a processor 102 of a first apparatus 100may control a transceiver 106 to receive a configured grant from a basestation. And, the processor 102 of the first apparatus 100 may obtain afirst hybrid automatic repeat request (HARQ) process identifier (ID)related to a first period of the configured grant. And, the processor102 of the first apparatus 100 may control the transceiver 106 totransmit a first physical sidelink shared channel (PSSCH) to a secondapparatus, based on a first resource included in the first period. And,the processor 102 of the first apparatus 100 may obtain a second HARQprocess ID related to a second period of the configured grant. And, theprocessor 102 of the first apparatus 100 may control the transceiver 106to transmit a second PSSCH to the second apparatus, based on a secondresource included in the second period

According to an embodiment of the present disclosure, a first apparatusfor performing wireless communication may be proposed. For example, thefirst apparatus may comprise: one or more memories storing instructions;one or more transceivers; and one or more processors connected to theone or more memories and the one or more transceivers. For example, theone or more processors may execute the instructions to: receive aconfigured grant from a base station; obtain a first hybrid automaticrepeat request (HARQ) process identifier (ID) related to a first periodof the configured grant; transmit a first physical sidelink sharedchannel (PSSCH) to a second apparatus, based on a first resourceincluded in the first period; obtain a second HARQ process ID related toa second period of the configured grant, wherein the second HARQ processID related to the second period is the same as the first HARQ processID; and transmit a second PSSCH to the second apparatus, based on asecond resource included in the second period, wherein a new dataindicator (NDI) related to the second PSSCH is a value to which a NDIrelated to the first PSSCH is toggled, based on the second HARQ processID which is the same as the first HARQ process ID.

According to an embodiment of the present disclosure, an apparatusconfigured to control a first user equipment (UE) may be proposed. Forexample, the apparatus may comprise: one or more processors; and one ormore memories operably connectable to the one or more processors andstoring instructions. For example, the one or more processors mayexecute the instructions to: receive a configured grant from a basestation; obtain a first hybrid automatic repeat request (HARQ) processidentifier (ID) related to a first period of the configured grant;transmit a first physical sidelink shared channel (PSSCH) to a secondUE, based on a first resource included in the first period; obtain asecond HARQ process ID related to a second period of the configuredgrant, wherein the second HARQ process ID related to the second periodis the same as the first HARQ process ID; and transmit a second PSSCH tothe second UE, based on a second resource included in the second period,wherein a new data indicator (NDI) related to the second PSSCH is avalue to which a NDI related to the first PSSCH is toggled, based on thesecond HARQ process ID which is the same as the first HARQ process ID.

According to an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be proposed.For example, the instructions, when executed, may cause a firstapparatus to: receive a configured grant from a base station; obtain afirst hybrid automatic repeat request (HARQ) process identifier (ID)related to a first period of the configured grant; transmit a firstphysical sidelink shared channel (PSSCH) to a second apparatus, based ona first resource included in the first period; obtain a second HARQprocess ID related to a second period of the configured grant, whereinthe second HARQ process ID related to the second period is the same asthe first HARQ process ID; and transmit a second PSSCH to the secondapparatus, based on a second resource included in the second period,wherein a new data indicator (NDI) related to the second PSSCH is avalue to which a NDI related to the first PSSCH is toggled, based on thesecond HARQ process ID which is the same as the first HARQ process ID.

FIG. 13 shows a procedure in which a second apparatus performs wirelesscommunication, according to an embodiment of the present disclosure. Theembodiment of FIG. 13 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 13 , in step S1310, a second apparatus may receive afirst physical sidelink shared channel (PSSCH) from a first apparatus,based on a first resource included in a first period of a configuredgrant. In step S1320, the second apparatus may receive a second PSSCHfrom the first apparatus, based on a second resource included in asecond period of the configured grant. For example, a new data indicator(NDI) related to the second PSSCH may be a value to which a NDI relatedto the first PSSCH is toggled, based on a second hybrid automatic repeatrequest (HARQ) process identifier (ID) which is the same as a first HARQprocess ID, the first HARQ process ID may be related to the firstperiod, and the second HARQ process ID may be related to the secondperiod.

For example, the first HARQ process ID may be mapped one-to-one with afirst sidelink (SL) process ID related to the first PSSCH.

The above-described embodiment may be applied to various devices to bedescribed below. For example, a processor 202 of a second apparatus 200may control a transceiver 206 to receive a first physical sidelinkshared channel (PSSCH) from a first apparatus, based on a first resourceincluded in a first period of a configured grant. And, the processor 202of the second apparatus 200 may control the transceiver to receive asecond PSSCH from the first apparatus, based on a second resourceincluded in a second period of the configured grant.

According to an embodiment of the present disclosure, a second apparatusfor performing wireless communication may be proposed. For example, thesecond apparatus may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:receive a first physical sidelink shared channel (PSSCH) from a firstapparatus, based on a first resource included in a first period of aconfigured grant; and receive a second PSSCH from the first apparatus,based on a second resource included in a second period of the configuredgrant, wherein a new data indicator (NDI) related to the second PSSCH isa value to which a NDI related to the first PSSCH is toggled, based on asecond hybrid automatic repeat request (HARQ) process identifier (ID)which is the same as a first HARQ process ID, wherein the first HARQprocess ID is related to the first period, and wherein the second HARQprocess ID is related to the second period.

For example, the first HARQ process ID may be mapped one-to-one with afirst sidelink (SL) process ID related to the first PSSCH.

Hereinafter, device(s) to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 14 shows a communication system 1, based on an embodiment of thepresent disclosure. The embodiment of FIG. 14 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 14 , a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

Here, wireless communication technology implemented in wireless devices100 a to 100 f of the present disclosure may include Narrowband Internetof Things for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 a to100 f of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called by various names includingenhanced Machine Type Communication (eMTC), and the like. For example,the LTE-M technology may be implemented as at least any one of variousstandards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTEnon-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine TypeCommunication, and/or 7) LTE M, and is not limited to the name describedabove. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 a to 100 f of thepresent disclosure may include at least one of Bluetooth, Low Power WideArea Network (LPWAN), and ZigBee considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)related to small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be called byvarious names.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 15 shows wireless devices, based on an embodiment of the presentdisclosure.

Referring to FIG. 15 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 14 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 16 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

Referring to FIG. 16 , a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 16 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 15 . Hardwareelements of FIG. 16 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 15 . For example, blocks1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 15. Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 15 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 15 .

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 16 . Herein, the codewords are encoded bitsequences of information blocks. The information blocks may includetransport blocks (e.g., a UL-SCH transport block, a DL-SCH transportblock). The radio signals may be transmitted through various physicalchannels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 16 . For example, the wireless devices(e.g., 100 and 200 of FIG. 15 ) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 17 shows another example of a wireless device, based on anembodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 14 ).

Referring to FIG. 17 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 15 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 15 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 15 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 14 ), the vehicles (100 b-1 and 100 b-2 of FIG. 14 ), the XRdevice (100 c of FIG. 14 ), the hand-held device (100 d of FIG. 14 ),the home appliance (100 e of FIG. 14 ), the IoT device (100 f of FIG. 14), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 14 ), the BSs (200 of FIG. 14 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 17 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 17 will be described indetail with reference to the drawings.

FIG. 18 shows a hand-held device, based on an embodiment of the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT).

Referring to FIG. 18 , a hand-held device 100 may include an antennaunit 108, a communication unit 110, a control unit 120, a memory unit130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. Blocks 110 to 130/140 a to 140 c correspond tothe blocks 110 to 130/140 of FIG. 17 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 19 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure. The vehicle or autonomous vehicle may beimplemented by a mobile robot, a car, a train, a manned/unmanned AerialVehicle (AV), a ship, etc.

Referring to FIG. 19 , a vehicle or autonomous vehicle 100 may includean antenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 17 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing, by a first device,wireless communication, the method comprising: receiving, through radioresource control (RRC) signaling, a configured sidelink grant; setting ahybrid automatic repeat request (HARQ) process ID for a first physicalsidelink shared channel (PSSCH) duration to a first HARQ process IDderived based on the first PSSCH duration occurring in a firstconfigured grant (CG) period of the configured sidelink grant, based onthe configured sidelink grant being activated and the first PSSCHduration corresponding to a first PSSCH transmission opportunity withinthe first CG period of the configured sidelink grant; setting a new dataindicator (NDI) to a toggled value compared to a value of a previoustransmission corresponding to sidelink identification information and afirst sidelink process ID of a medium access control (MAC) protocol dataunit (PDU), wherein there is one-to-one mapping between HARQ process IDsincluding the first HARQ process ID and sidelink process IDs includingthe first sidelink process ID, and wherein the sidelink identificationinformation includes a source ID related to the first device, adestination ID related to a second device, and a cast type indicatorrelated to the previous transmission; and transmitting to the seconddevice, sidelink control information (SCI) including the first sidelinkprocess ID and the NDI, on the first PSSCH duration.
 2. The method ofclaim 1, wherein the one-to-one mapping between the HARQ process IDs andthe sidelink process IDs is based on the configured sidelink grant beingreceived.
 3. The method of claim 1, wherein the first HARQ process ID ismapped to the first sidelink process ID.
 4. The method of claim 1,wherein sidelink identification information of the first device relatedto a current transmission corresponding to the first sidelink process IDis the same as sidelink identification information of the first devicerelated to the previous transmission.
 5. The method of claim 1, furthercomprising: receiving a dynamic grant including a retransmissionresource related to the first HARQ process ID from a base station; andretransmitting the MAC PDU to the second device, based on theretransmission resource.
 6. The method of claim 5, wherein an NDIrelated to the retransmission is the same as the NDI included in theSCI.
 7. The method of claim 5, wherein a second sidelink process IDrelated to the retransmission is the same as the first sidelink processID.
 8. The method of claim 1, further comprising: flushing a bufferrelated to the first HARQ process ID, based on the configured sidelinkgrant being activated and the first PSSCH duration corresponding to thefirst PSSCH transmission opportunity within the first CG period of theconfigured sidelink grant.
 9. The method of claim 8, wherein the bufferrelated to the first HARQ process ID is flushed based on expiration of atimer related to the first HARQ process ID.
 10. The method of claim 1,further comprising: reporting a mapping relationship related to thefirst HARQ process ID and the first sidelink process ID.
 11. The methodof claim 10, wherein the mapping relationship is reported through aradio resource control (RRC) message or a medium access control (MAC)control element (CE).
 12. A first device for performing wirelesscommunication, the first device comprising: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers,wherein the one or more processors execute the instructions to: receive,through radio resource control (RRC) signaling, a configured sidelinkgrant; set a hybrid automatic repeat request (HARQ) process ID for afirst physical sidelink shared channel (PSSCH) duration to a first HARQprocess ID derived based on the first PSSCH duration occurring in afirst configured grant (CG) period of the configured sidelink grant,based on the configured sidelink grant being activated and the firstPSSCH duration corresponding to a first PSSCH transmission opportunitywithin the first CG period of the configured sidelink grant; set a newdata indicator (NDI) to a toggled value compared to a value of aprevious transmission corresponding to sidelink identificationinformation and a first sidelink process ID of a medium access control(MAC) protocol data unit (PDU), wherein there is one-to-one mappingbetween HARQ process IDs including the first HARQ process ID andsidelink process IDs including the first sidelink process ID, andwherein the sidelink identification information includes a source IDrelated to the first device, a destination ID related to a seconddevice, and a cast type indicator related to the previous transmission;and transmit, to the second device, sidelink control information (SCI)including the first sidelink process ID and the NDI, on the first PSSCHduration.
 13. A device configured to control a first user equipment(UE), the device comprising: one or more processors; and one or morememories operably connectable to the one or more processors and storinginstructions, wherein the one or more processors execute theinstructions to: receive, through radio resource control (RRC)signaling, a configured sidelink grant; set a hybrid automatic repeatrequest (HARQ) process ID for a first physical sidelink shared channel(PSSCH) duration to a first HARQ process ID derived based on the firstPSSCH duration occurring in a first configured grant (CG) period of theconfigured sidelink grant, based on the configured sidelink grant beingactivated and the first PSSCH duration corresponding to a first PSSCHtransmission opportunity within the first CG period of the configuredsidelink grant; set a new data indicator (NDI) to a toggled valuecompared to a value of a previous transmission corresponding to sidelinkidentification information and a first sidelink process ID of a mediumaccess control (MAC) protocol data unit (PDU), wherein there isone-to-one mapping between HARQ process IDs including the first HARQprocess ID and sidelink process IDs including the first sidelink processID, and wherein the sidelink identification information includes asource ID related to the first UE, a destination ID related to a secondUE, and a cast type indicator related to the previous transmission; andtransmit, to the second UE, sidelink control information (SCI) includingthe first sidelink process ID and the NDI, on the first PSSCH duration.